BNA: Drumming as well as "Kwirr" calls are heard. CZ 23/02/2004. [Three Drums (0:09, 0:23, 0:43) and one example of the "Kwirr" Call of BNA (0:19). I am not sure of the source for the call given at 0:40, but even if it was given by this species, I cannot be certain which vocalization it represents. Quality unchanged (2) - CAM - 4 May 2005]